Modelling of Corrosion Protection as Standby System for Coated Reinforced Concrete Structures

Kamaitis, Zenonas

doi:10.3846/1392-3730.2009.15.387-394

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…Only not cracking coatings are successful in case of crude oil products influence. Interesting modeling of corrosion protection for reinforced concrete structures with surface coatings is presented in Kamaitis (2008Kamaitis ( , 2009.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Crude Oil Products on Rc Structure Destruction / Neapdirbtos Naftos Produktų Įtaka Gelžbetonio Struktūros Suardymui

Błaszczyński

2011

Journal of Civil Engineering and Management

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It is known that RC industrial structures are liable to the effects of crude oil products, which may have a disadvantageous influence on their exploitation and safety. Within this research, the influence of crude oil products on the physico-mechanical properties of mature concrete, as well as other possible mechanisms of RC progressive failure have been analysed. Crude oil products with a very low neutralisation number were found to be physico-chemical active agents affecting concrete. Experimental analysis undertaken in order to assess the compressive strength of concrete and its bond to reinforcements is described. Long term investigations were conducted in order to determine the effects of a group of crude oil products—mineral oils—on the properties of concrete and reinforced concrete samples. Detailed results of this research are included in the paper. Comparing the influence of different mineral oils on the compressive strength of concrete, leads to the conclusion that there are large differences in their effects. The paper also attempts to answer the question of how the characteristics of RC structure bonds change over time of exposure to mineral oils. The problem of the influence of organic agents on concrete and its bond under conditions of natural humidity is mainly linked to its structure. In the case of oil products, there are four possible mechanisms i.e., biological, chemical, physical and physico-chemical, affecting concrete, its bond and, sometimes, reinforcements. Each of these mechanisms is presented. Necessary laboratory tests were performed in order to prove the thesis that the content of active surface polar molecules in active agents is the reason behind concrete damage brought about by crude oil products. The conducted experiments demonstrated that the effects of artificial environments (on concrete) prepared by the author, are the same as those of widely used industrial mineral oils. Santrauka Yra žinoma, kad gelžbetoninės pramoninės konstrukcijos yra jautrios neapdirbtos naftos produktams, o tai gali turėti neigiamąįtaką jų eksploatacijai ir saugumui. Šiame tyrime analizuojama neapdirbtos naftos produktų įtaka brandaus betono fizinėms ir mechaninėms savybėms, aptariami galimi poveikiai, skatinantys progresyvų gelžbetonio irimą. Buvo nustatyta, kad neapdirbtos naftos produktai, turintys labai žemą neutralizavimo laipsnį, yra fiziniai ir cheminiai reagentai, veikiantys betoną. Straipsnyje aptariamas eksperimentas, kuris buvo atliktas siekiant įvertinti betono stiprį gniuždant ir jo sukibtį su armatūra. Buvo atlikti ilgai trunkantys bandymai, siekiant nustatyti neapdirbtos naftos produktų grupės—mineralinių naftos produktų—poveikį betono savybėms ir armatūros bandiniams. Šiame straipsnyje pateikiami išsamūs tyrimų rezultatai. Skirtingų mineralinių naftos produktų poveikio betono stipriui palyginimas leidžia daryti išvadą, kad poveikiai gali būti labai skirtingi. Straipsnyje stengiamasi atsakyti į klausimą—kaip keičiasi gelžbetonio sukibtis laikui bėgant, jo neapsaugojus nuo mineralinių naftos produktų poveikio. Natūralios drėgmėssąlygomis organinių reagentų įtaka betonui ir jo sukibčiai daugiausia priklauso nuo jo struktūros. Veikiant naftos produktams galimi keturi pagrindiniai poveikiai—biologinis, cheminis, fizinis, fizinis ir cheminis, kurie veikia betoną, jo sukibimą ir kartais armatūrą. Kiekvienas šių poveikių yra aptariamas straipsnyje. Siekiant įrodyti teiginį, kad aktyvios paviršiaus polinės molekulės, esančios aktyviuose reagentuose, yra priežastis, dėl kurios betonas veikiamas neapdirbtos naftos produktų, buvo atlikti būtini laboratoriniai bandymai. Atlikti eksperimentai parodė, kad dirbtinės aplinkos poveikiai (betonui), sumodeliuoti autoriaus, yra tokie patys kaip ir tie, kurie atsiranda dėl plačiai naudojamų pramoninių naftos produktų.

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Section: Discussionmentioning

confidence: 99%

The Influence of Crude Oil Products on Rc Structure Destruction / Neapdirbtos Naftos Produktų Įtaka Gelžbetonio Struktūros Suardymui

Błaszczyński

2011

Journal of Civil Engineering and Management

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“…Thus, the competence for assessing the corrosion risk properly and taking proper repair actions if necessary, is extremely important [6][7][8][9][10]. The application of the polarization techniques [11] and particularly the method of impedance spectroscopy for assessing the corrosion rate of the reinforcement in the reinforced concrete structures encounters considerable difficulties [12].…”

Section: Introductionmentioning

confidence: 99%

Investigation and Modelling of the Impact of Reinforcement Diameter in Concrete on Shapes of Impedance Spectra

Jaśniok

2013

Procedia Engineering

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The impedance test results of the steel reinforcement of various diameters, which was passivated and corroded in concrete specimens, were analysed. The impedance plots clearly indicated the tendencies for spectra shapes of steel rebars to change depending on their diameters. A 3-dimensional model of steel-concrete system was developed to explain the observed effect. This system was composed of the identical electrical equivalent circuits connected in parallel. Each equivalent scheme was characteristic for a theoretical conductive path during the measurement, which was defined between a counter-electrode and the reinforcement. This model was used with the rectangular counter electrode to simulate the formation of impedance spectra characteristic for a single reinforcing bar with the concrete cover of any thickness, a variable diameter and a variable polarization area. The simulation modelling the impact of various reinforcement diameters verified the tendencies for impedance spectra of steel in concrete to change their shapes. The improved of fitting quality of the model spectra to the experimental ones were obtained by considering in that model the moisture content in concrete. IntroductionThe corrosive degradation of reinforced concrete structures [1-3] presents a real threat to their safe use and the reliability [4], [5]. Thus, the competence for assessing the corrosion risk properly and taking proper repair actions if necessary, is extremely important [6-10]. The application of the polarization techniques [11] and particularly the method of impedance spectroscopy for assessing the corrosion rate of the reinforcement in the reinforced concrete structures encounters considerable difficulties [12]. These problems are related to complex measurement conditions and the complicated testing system. The studies are carried out using the potentiostat in a three-electrode system, in which the structure reinforcement (made of long steel bars) serves as the working electrode, and the electrode of known and satisfactory reversible potential serves as the reference electrode. The counter-electrode is applied to the surface of the reinforced concrete element to make the reinforcement polarization possible. The counter-electrode along with the reference electrode in a single enclosure formed the so called measuring head. The use of the head created a situation considerably different from the laboratory conditions form the measurement in an electrochemical vessel in which the large counter electrode uniformly polarizes the small tested electrode of a simple geometry. Regarding the measurements on the reinforcement in the reinforced concrete elements, the area of the tested electrode was significantly larger than that of the counter electrode applied to concrete. This resulted in the very non-uniform polarization of steel rebars. Moreover, the polarization area of the reinforcement required for assessing the rate of the electrochemical processes was unknown. The additional counter electrode in a form of a guard ring reducing the...

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“…Reinforcement corrosion caused by de-icing salt is also a major and common type of concrete bridge deterioration in other countries of the Baltic region (Kamaitis 2009).…”

Section: Introductionmentioning

confidence: 99%

Concrete bridge deterioration caused by de-icing salts in high traffic volume road environment in Latvia

Gode

Paeglītis

2014

The Baltic Journal of Road and Bridge Engineering

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Design for durability of road infrastructures is becoming increasingly important in view of its large impact on economics. Reinforcement corrosion is the most common cause of concrete deterioration of bridge structures in Latvia. The ingress of chlorides is often considered to be the major threat to durability of concrete structures. During the winter season de-icing salts are spread out on roads to avoid formation of ice and ensure the anti-sliding properties of the road surface. The melting water mixes with de-icing salt are splashed and sprayed on reinforced concrete pier structures by passing vehicles. Absorbed water with chloride ions initiates and accelerates the reinforcement corrosion process. This paper highlights the results of investing accumulation of chlorides in reinforced concrete bridge piers located near high traffic volume roads in Latvia. The chloride contents were determined on different surfaces of reinforced concrete piers. Environmental conditions were analysed and prediction of remaining service life for chloride induced reinforcement corrosion was performed.

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Modelling of Corrosion Protection as Standby System for Coated Reinforced Concrete Structures

Cited by 13 publications

References 22 publications

The Influence of Crude Oil Products on Rc Structure Destruction / Neapdirbtos Naftos Produktų Įtaka Gelžbetonio Struktūros Suardymui

The Influence of Crude Oil Products on Rc Structure Destruction / Neapdirbtos Naftos Produktų Įtaka Gelžbetonio Struktūros Suardymui

Investigation and Modelling of the Impact of Reinforcement Diameter in Concrete on Shapes of Impedance Spectra

Concrete bridge deterioration caused by de-icing salts in high traffic volume road environment in Latvia

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